* {
    margin: 0;
    padding: 0;
}

body {
    background-color: #e1e1e1;
    font-family: sans-serif;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.key {
    border: 1px solid rgba(51, 51, 51, 0.455);
    margin-right: 20px;
    padding: 20px;
    box-shadow: 3px 3px 3px rgba(0, 0, 0, 0.1);
    font-size: 20;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    min-width: 150px;
    position: relative;
    font-weight: bold;
}
.key:last-child {
    margin-right: 0;
}
.key small {
    position: absolute;
    top: -25px;
    font-size: 14px;
    color:#333;
}